Documentation

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The following, comprehensive list is presented as a basis for discussion between regulatory authorities and design practitioners [1].

Site Description[edit]

  • Location (key plan, municipal address, nearest roads, watershed and subwatershed);
  • Existing Conditions (land use on site and surrounding areas);
  • Natural Heritage features;
  • Proposed Conditions;
  • Drainage Area (for the site, tributary and watershed);
  • Watercourses, wetlands present on site, and type (permanent or intermittent);
  • Drainage patterns and ultimate drainage location/outfall;

Background Information[edit]

  • Pre-submission meeting verification;
  • Reports from pre-consultation with MOECC and other agencies (especially related LID credits);
  • Watershed plans;
  • Sub-Watershed plans;
  • Master drainage plans (MDPs);
  • Other previous reports and relevant SWM requirements;
  • Existing models;
  • Geotechnical report;
  • Hydrogeological report;

Figures and drawings[edit]

  • Location plan in the report;
  • Key plan on the drawings;
  • All watercourses and names of watercourses shown on all figures and drawings;
  • Pre-development and post-development drainage plans for hydrologic model(s) which include:
    • Existing contours;
    • Drainage direction (minor and major system);
    • Catchments ID's;
    • Areas and imperviousness;
    • Uncontrolled areas;
    • 100 year capture;
    • Site outlets; and
    • LID facility location and associated tributary areas;
  • Model schematics;
  • Storm drainage, grading and general servicing plans;
  • LID practice design drawings and details;
  • Erosion and sediment control plans;

Design Information[edit]

  • Consistent hydrology modelling to be utilized for each development application and/or consistent with MESP/MSP/Studies.
  • Supporting information has been included for all modelling parameters and calculations.
  • Stage-Storage-Discharge calculations provided for each LID facility including design information on control and emergency overflow weirs.
  • Flow and storage summary tables provided which reference the associated drainage area, catchment ID, outlet(s) and differentiate between controlled and uncontrolled areas.
  • Identify and show seasonal high groundwater levels in report and on drawings;
  • Per MOECC SWM manual, 2003 (i.e. Drainage area, required volume, slopes, forebay, etc.);
  • The SWM report and drawings are to include a table summarizing required storage, provided storage and associated elevation and flow for the permanent pool, 25mm (extended detention), and 2 through 100 year return period storm events where applicable for each facility;
  • An operations and maintenance manual (includings a maintenance schedule) should be included in the SWM Report for all LID facilities in accordance with municipal requirements;
  • Complete information on proposed manufactured treatment devices is to be provided including current status under ETV protocols;

Quantity control[edit]

  • Runoff coefficient or imperviousness calculations;
  • Analysis using appropriate storm distributions;
  • Pre-development peak flow (m³/s);
  • Post-development uncontrolled peak flow (m³/s);
  • Post-development controlled peak flow (m³/s);
  • LID Facility Type;
  • Stage – Storage – Discharge Table;
  • Outlet design and calculations;
  • Total storage required (m3);
  • Total storage provided (m3);
  • Table comparing provided versus required;
  • Overland flow conveyance and design;
  • External drainage conveyance (100 year and Regional);

Quality control[edit]

  • Level of Protection;
  • Drainage Area to Facility in hectares;
  • Percentage Impervious – total and directly connected areas;
  • SWM Facility Monitoring and Maintenance Requirements;

Hazard land management[edit]

  • Regional event and 1:100 year flood lines under existing and proposed conditions shown on appropriate plan drawings;
  • Valley top of bank, stream erosion, steep slope allowances and meanderbelt assessed (confined stream systems only);
  • Wetlands and required setbacks determined and identified on plans;
  • Meanderbelt assessment and/or setback determined and identified on plans;
  • Wave uprush and/or wind setup elevations calculated;
  • “Limit of development” shown on plans;
  • Survey and floodplain mapping submitted (see below);
  • Hydraulic modelling and analysis including digital files;

Other[edit]

  • Upon approval of the SWM design, a digital copy of the stormwater drainage plan is to be submitted including the location and size of the SWM facility in GIS format;

Floodplain mapping and documentation minimum requirements[edit]

  1. Hydraulic sections with regulated floodplain elevations and cross-section identification;
  2. Existing and proposed floodplain delineation;
  3. Topographic information including elevations and contours;
  4. Conveyance structures including dams, bridges, culverts and weirs;
  5. Man-made structures as applicable including buildings, roads, railways and trails;
  6. Natural reservoirs or natural storage areas;
  7. Spills analysis as applicable;
  8. Cut/fill analysis in the regulated area as applicable;
  9. Natural features such as watercourses and wetlands;
  10. Floodplain mapping and supporting documentation signed and stamped by a P.Eng.

Survey documentation minimum requirements[edit]

For any submission which contains drawings or figures that present survey information, the following list of minimum requirements must be included:

  1. Document with text descriptor identifying overall approach and methodology;
  2. Drawing/Figure Title;
  3. Date, and Revision List where applicable;
  4. Legible Scale and North direction arrow;
  5. OLS Surveyor Name and contact information, as applicable;
  6. Geodetic benchmark data used in survey, as applicable;
  7. Available survey data for topographic surface, structures, features, etc.;
  8. Structures invert, obvert elevations and dimensions as applicable;
  9. Bathymetry as applicable;
  10. Documentation to support reported data accuracy;
  11. Methodology for survey data collected i.e. Total Station, GIS, Rod and Level;
  12. Photo log of structures survey including upstream, downstream and structures completed with structure survey;
  13. Drawings and / or figures to be submitted both electronically and in hard copy as requested;
  14. Digital copy of the survey data when applicable; and
  15. Submission components to be stamped and signed by an OLS, P.Eng. or C.E.T. as relevant.

Geospatial data submission minimum requirements[edit]

For a submission which contain drawings, figures, reports, modelling and / or memos that present geospatial information and its analysis; the following list of minimum requirements must be included:

  1. Text summary identifying methodology and software used in geospatial analysis;
  2. Acquisition type i.e. LIDAR, orthophotos, etc.;
  3. Date of data acquisition;
  4. Name of supplier of digital information and their contact information;
  5. Quality Assurance / Quality Control methodology for geo-spatial as applicable;
  6. Data Co-ordinate system;
  7. Data Projection;
  8. Data Horizontal and vertical resolution;
  9. Data Accuracy for each axis as applicable;
  10. Description of grid resolution;
  11. Drawing and / or figure scale identified as applicable;
  12. Contours presented at minimum 0.5 m increments;
  13. Orthophoto Elevation Data i.e. study area break lines and DTM points;
  14. LIDAR Elevation Data i.e. study area point cloud (as applicable);
  15. Digital Elevation Model (DEM) as applicable;
  16. Description of modifications to surface including adjustments to the TIN from other sources (i.e. surveyed culverts, new infrastructure invert and obvert elevations etc.);
  17. Flood limit data;
  18. Drawings and / or figures to be submitted both electronically and in hard copy when requested;
  19. In modelling files and documentation to maintain existing watercourse naming conventions were applicable;
  20. Projected Co-ordinate system: Preferably NAD 1983 UTM Zone 17N;
  21. Accepted Original Geospatial Data file format: File Geodatabase or Shapefiles; and
  22. Submission components to be stamped and signed by an OLS, P.Eng. or C.E.T. as relevant.
  1. ↑ Ontario Provincial Standard Specification. (2014). Construction Specification and for Seed and Cover OPSS.PROV 804. Retrieved from http://www.raqsb.mto.gov.on.ca/techpubs/ops.nsf/0/3a785d2f480f9349852580820062910a/$FILE/OPSS.PROV 804 Nov2014.pdf

The drainage area of one or more contributing watercourses to a river.

The drainage area of a river.

An area of land that drains into a river or a lake. The boundary of a watershed is based on the elevation (natural contours) of a landscape.

The point, location, or structure where wastewater or drainage discharges from a sewer pipe, ditch or other conveyance to a receiving body of water.

Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

Stormwater Management

refers to the characteristics and functions of a system prior to urban development.

Natural or artificial means of intercepting and removing surface or subsurface water (usually by gravity).

Is a community-scale planning assessment of servicing and environmental considerations for a development project.

The total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds.

The land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale.

The total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds.

A pretreatment basin at the inlet of a practice that allow settling out of sediment and associated contaminants suspended in urban runoff.

A stormwater design features that provides for the gradual release of a volume of water in order to increase settling of pollutants and protect downstream channels from frequent storm events.

The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.

Water from rain, snow melt, or irrigation that flows over the land surface.

A hard surface area (e.g., road, parking area or rooftop) that prevents or retards the infiltration of water into the soil.

(1) The wearing away of the land surface by moving water, wind, ice or other geological agents, including such processes as gravitation creep; (2) Detachment and movement of soil or rock fragments by water, wind, ice or gravity (i.e. Accelerated, geological, gully, natural, rill, sheet, splash, or impact, etc).

The area adjacent to a stream that is, on average, inundated once a century

(a) A natural well-defined channel produced wholly or in part by a definite flow of water and through which water flows continuously or intermittently. Also, a ditch, canal, aqueduct, or other artificial channel for the conveyance of water to or away from a given place, as for the draining of a swamp.

(b) A stream or current of water. Legally, a natural stream arising in a given drainage basin but not wholly dependent for its flow on surface drainage in its immediate area, flowing in a channel with a well-defined bed between visible banks or through a definite depression (as a ravine or swamp) in the surrounding land, having a definite and permanent periodic supply of water (the stream may be intermittent), and usually, but not necessarily having a perceptible current in a particular direction and discharging at affixed point into another body of water.

(c) A legal right permitting the use of a flow of a stream (especially of one flowing through one’s land) or the receipt of water discharged upon land belonging to another.

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